#!/usr/bin/env python3

while(True):

	in1=input("first data: ")
	in2=input("second data: ")

	try:
		d1=int(in1)
		d2=int(in2)

	except ValueError:
		print(" you input is not digtal!!!!!!"	)
	else:
		print("result add is :",d1+d2)


